Type of Publication:  Journal article 
Publication status:  Published 
Author:  Bianchi, Luigi Amedeo; Blömker, Dirk 
Year of publication:  2016 
Published in:  Stochastic Processes and their Applications ; 126 (2016), 10.  pp. 31713201.  ISSN 03044149.  eISSN 1879209X 
ArXivID:  arXiv:1507.06102v3 
DOI (citable link):  https://dx.doi.org/10.1016/j.spa.2016.04.024 
Summary: 
We study the approximation of SPDEs on the whole real line near a change of stability via modulation or amplitude equations, which acts as a replacement for the lack of random invariant manifolds on extended domains. Due to the unboundedness of the underlying domain a whole band of infinitely many eigenfunctions changes stability. Thus we expect not only a slow motion in time, but also a slow spatial modulation of the dominant modes, which is described by the modulation equation. As a first step towards a full theory of modulation equations for nonlinear SPDEs on unbounded domains, we focus, in the results presented here, on the linear theory for one particular example, the SwiftHohenberg equation. These linear results are one of the key technical tools to carry over the deterministic approximation results to the stochastic case with additive forcing. One technical problem for establishing error estimates rises from the spatially translation invariant nature of spacetime white noise on unbounded domains, which implies that at any time we can expect the error to be always very large somewhere in space.

Subject (DDC):  510 Mathematics 
Keywords:  Modulation equation, Amplitude equation, Unbounded domain, Random fields, Gaussian, processes, Attractivity, Approximation, Linear theory, Stochastic convolution 
Refereed:  Yes 
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BIANCHI, Luigi Amedeo, Dirk BLÖMKER, 2016. Modulation Equation for SPDEs in unbounded domains with spacetime white noise : Linear Theory. In: Stochastic Processes and their Applications. 126(10), pp. 31713201. ISSN 03044149. eISSN 1879209X. Available under: doi: 10.1016/j.spa.2016.04.024
@article{Bianchi2016Modul45299, title={Modulation Equation for SPDEs in unbounded domains with spacetime white noise : Linear Theory}, year={2016}, doi={10.1016/j.spa.2016.04.024}, number={10}, volume={126}, issn={03044149}, journal={Stochastic Processes and their Applications}, pages={31713201}, author={Bianchi, Luigi Amedeo and Blömker, Dirk} }
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